Multi-Band Base Station Antenna for Diversity and MIMO-Applications

In this paper an antenna element for the application in multi band base station antennas for mobile communication systems is presented. The antenna element covers the most important frequency bands in Europe and Asia (GSM 1800, UMTS and 2500MHz), respects important features regarding manufacturing, signal disttribution and signal intermodulation. Since the antenna can be fed independently by two orthogonal stripline feeds, polarization diversity can be realized within a single antenna element. This will be used in polarization diversity and MIMO systems to enhance channel capacity. The possible channel enhancement due to the polarization diversity feature of this antenna will be derived.